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CNIM TEST QUESTIONS AND ANSWERS
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CNIM TEST QUESTIONS AND ANSWERS
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CNIM TEST QUESTIONS AND ANSWERSIn BAEP's, cochlear nucleus lesion causes? - Answers -Increased III-V, increased I-V
Which modality is most useful in monitoring the integrity of the corticospinal tracts
during resection of an intramedullary spinal cord tumor? - Answers -D-Waves
The stimulus used in a brainstem auditory evoked potential study is a click with a peak
acoustic power in the range of - Answers -2000 to 4000Hz
Which of the following tibial nerve responses is not a near field response? - Answers -
N31
How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms
of resistance? - Answers -0.2 amps
In BAEP's blood, betadine or irrigation fluid in tubing causes: - Answers -Increase in
absolute latency, normal inter-peak latencies
In averaging, the period of analysis is called _______ or ________. - Answers -Epoch,
sweep length
While monitoring BAEP, there was a prolongation of wave I through V by more than 2
msec. Which of the following choices is NOT a possible cause? - Answers -Increase of
isoflurane anesthesia
Involuntary movement - Answers -Ataxia
Smaller surface of stimulating electrodes: - Answers -Higher Current Density
During posterior fossa surgery, when BAEPs are used for monitoring brainstem
function, it is most important to: - Answers -Stimulate and record from the contralateral
side
P100 of a VEP will have the highest amplitude in which derivation? - Answers -MO-Fz
Cranial nerve VII must be monitored concurrently with BAERs. - Answers -True
Nerves of the body, such as median, ulnar, and femoral are formed from the: - Answers
-Dorsal and ventral rami
Upper motor neuron extends from: - Answers -Precentral gyrus to ventral horn
Increasing the stimulus rate of BAEPs - Answers -Decreases amplitude and increases
latency
,Which of the following is the normal interocular latency difference of P100? - Answers -
Less than 15 msec
An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of
10mV is: - Answers -1mV/mm
When identifying wave IV and V of a BAEP, which of the following would be most
helpful? - Answers -Cz-Contra ear montage
The maximum leakage current should be - Answers -100 uA
Wave V is usually the most prominent peak after - Answers -5.5 msec
Which of the following montages will best demonstrate waves I through V of the BAEP?
- Answers -Cz-ipsilateral ear
P13 Generator - Answers -Spinomedullary junction
An electrode recording from Erb's point is placed - Answers -2-3 cm above the clavicle
In BAEP's, perforated or hardened tympanic membrane causes: - Answers -Increase in
absolute latency, normal inter-peak latencies
Which of the following temperatures should be annotated as being hypothermic? -
Answers -34 degrees C
Dyskinesia: - Answers -Abnormal Movement
Sensory supply of the posterior 1/3rd of the tongue is from which nerve? - Answers -
Glossopharyngeal
What is the best montage for distinguishing a IV/V complex? - Answers -Cz-Contra Ear
Loss of a unilateral waveform is never a concern as long as wave V is present on the
other ear. - Answers -False
Which of the following are thalamic nuclei for the somatosensory pathway? - Answers -
VPL nucleus
What does an increased N13-N20 central conduction time with normal N9-N20
conduction time and a normal nerve conduction velocity indicate? - Answers -Defect
above the lower medulla at or below the somatosensory cortex
The effect of hypotension on the evoked potential is: - Answers -Decreased amplitude,
increased latency
, Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential
waveform will be amplified to - Answers -0.50v
Which of the following monitoring modes is LEAST useful for skull base surgery? -
Answers -Tibial nerve SSEP
Which surgical approach will sacrifice hearing? - Answers -Translabyrinthine
Which muscle is innervated by L4-S1 nerve roots? - Answers -Tibialis anterior
Selective dorsal rhizotomy: - Answers -Reduces spasticity
The fibers anterior to the chiasm in the visual pathway are called: - Answers -Optic
nerves
During posterior fossa surgery, wave V of the BAEPs may increase in latency due to: -
Answers -Retraction of the cerebellum
When is it most appropriate to alert the surgical team of a problem with the monitoring?
- Answers -After a loss of 55% amplitude
If the distance between a patient and a pattern generator is reduced by one-half, the
angle at the eye subtended by each check is - Answers -Increased two times
In VEP we are testing ___________ vision, not ____________ vision. - Answers -
Central, periphial
Posterior Fossa - Answers -Brainstem
EEG electrodes during IONM should have impedances that range from: - Answers -
1000 to 5000 ohms
All components of brainstem auditory evoked potential waveforms reach adult
configuratiion by what age? - Answers -3-6 months
Which of the following evoked potential tests would have the lowest rate of abnormality
in patients with MS? - Answers -BAEP
Where do the optic tracts terminate and relay the visual impulses to the visual cortex? -
Answers -Lateral geniculate body
Why do we use electrodes made out of the same material? - Answers -To prevent
polarization
In ABR stimulation, the stimulus type which causes a negative pressure resulting in a
slightly earlier latency is - Answers -Rarefaction
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